*
Typical Value, measured at f/5.5. Effective Path Length will be slightly
different due to optical effect of prism on path length (less path length is
required for scopes faster than f/5.5, more for longer scopes).

** When
using the T2-08 plus T2-27 with the Herschel Wedge, the range of clearance
from top of the T2-08 to the filter glass surface is 38-44mm.